X lockup when opening firefox tab

nvidia 313.18-3

Archlinux bug report with logs:
Arch devs thinks its an nvidia driver problem, i am not so sure since i havent had problem with 313.18 on xorg-server 1.13.2.

No problem here on debian sid

towo:Defiant> inxi -v3
System:    Host: Defiant Kernel: 3.8-0.towo-siduction-amd64 x86_64 (64 bit, gcc: 4.7.2) 
           Desktop: Xfce 4.10.0 (Gtk 2.24.10) Distro: siduction 12.2.0 Riders on the Storm - xfce - (201212092126)
Machine:   System: 0000 product: P5K version: 0000
           Mobo: ASUSTeK model: P5K version: Rev 1.xx Bios: American Megatrends version: 1006 date: 03/05/2008
CPU:       Quad core Intel Core2 Quad CPU Q6700 (-MCP-) cache: 4096 KB flags: (lm nx sse sse2 sse3 ssse3 vmx) bmips: 21383.3 
           Clock Speeds: 1: 1596.00 MHz 2: 1596.00 MHz 3: 1596.00 MHz 4: 1596.00 MHz
Graphics:  Card: NVIDIA GK104 [GeForce GTX 650 Ti] bus-ID: 01:00.0 X.Org: 1.13.2 driver: nvidia Resolution: 1920x1080@60.0hz 
           GLX Renderer: GeForce GTX 650 Ti/PCIe/SSE2 GLX Version: 4.3.0 NVIDIA 313.18 Direct Rendering: Yes
Network:   Card: Atheros Attansic L1 Gigabit Ethernet driver: atl1 ver: 2.1.3 bus-ID: 02:00.0
           IF: eth0 state: up speed: 100 Mbps duplex: full mac: 00:22:15:5a:58:f4
Drives:    HDD Total Size: 2754.8GB (26.6% used) 1: model: WDC_WD10EALX 
           2: model: WDC_WD10EALX 3: model: ST3750840AS 4: model: Flash_Disk 
Info:      Processes: 162 Uptime: 4:23 Memory: 1486.2/7991.7MB Runlevel: 5 Gcc sys: 4.7.2 
           Client: Shell (bash 4.2.37) inxi: 1.8.38

towo, is 1.13.3 RC1

Does this happen consistently, or did it only happen once? These messages indicate that your GPU stopped responding.

Happened once.
I will try to reproduce it by upgrading again (i reverted to 1.13.2 to avoid this problem).

For the record,
I have not seen this crash again for about a week now.
There is an arch forum thread which could be the same problem though:

For me this seem to be a rare problem, i will get back if i run into it again.

I saw this problem again now, i.e. X hangs (100% cpu) when opening firefox tab.
I am now on xorg-1.14.0, nvidia-313.26 (GTX 460).
Bug report attached.
nvidia-bug-report.log.gz (64.7 KB)

Your GPU stopped responding again. Do you have a different GPU you could try, by any chance? Is it firmly seated in the PCI-E slot, with appropriate power connectors attached? Finally, if you run nvidia-settings and open the temperature monitor page, what is the GPU temperature when the freeze occurs?

This happen very seldom so i dont think there is any idea to try another card.
Also, the following post here seem to indicate the same problem:

There’s also this thread, this thread and possibly this thread which look they might be the same or a similar problem.

Second thread is in your list is mine … agree looks like it might it might be the same issue. Still waiting for a resolution.